打印语句后的输入语句先打印

Question

I have a print statement preeceeding and input statement. However the input statement prints first.

print('Warning this program renames files')
char =input ('Enter  Y to continue N to quit')

The terminal screen the results are:

Enter Y to continue N to quit
Warning this program renames files

if I introduce some form of delay between the two statements it works correctly. Example code:

print('Warning this program renames files')
for i in range (1,10000):
    j=i*i
char=input('Enter  Y to continue N to quit')

the output in the terminal is printed in the correct order

Warning this program renames files
Enter  Y to continue N to quit

Anyone know why this happens it looks like a race between the two statement to access the print functions and input seems to win unless you delay its execution.

Answer 1

Rather than a delay, try

import sys

print('Warning this program renames files')
sys.stdout.flush()
char = input('Enter  Y to continue N to quit')